For years I had this idea of ebook library management web app. I've actually started it already about 3 years ago but HD i had it on crashed and the testing server I had it on got stolen (talk about having to triple backup everything XD) so I have nothing to show :( Since codebase was so horrible I wanted to start over anyway but then wondering if I should waste time since there are so many document and ebook management web apps out there already and I am not sure if any of my ideas are original or otherwise useful.